Rau Titanium Tube Bundle rhaub nyob rau hauv 15% Aluminium Sulfate (Alum) daws ntawm 70 degree, Dab tsi yog qhov tseem ceeb ntawm Aluminium Hydroxide Scale Thickness uas ua rau 50% txo qis hauv kev hloov cua sov?
Tso lus
Rau Titanium Tube Bundle rhaub nyob rau hauv 15% Aluminium Sulfate (Alum) daws ntawm 70 degree, Dab tsi yog qhov tseem ceeb ntawm Aluminium Hydroxide Scale Thickness uas ua rau 50% txo cov cua sov ua haujlwm?
Hauv 15% aluminium sulfate (alum) ntawm 70 degree, aluminium hydroxide (Al (OH) ₃) scale precipitates ntawm kub titanium nto. Cov nplai muaj cov thermal conductivity tsawg (0.2–0.4 W / m·K, piv rau 21.9 W / m·K rau titanium). Ib qho tseem ceeb scale thickness ntawm 0.5 hli ua rau 50% txo nyob rau hauv tshav kub hloov efficiency, yuav tsum tau ib tug 2 × nce nyob rau hauv lub sij hawm cua sov los yog lub hwj chim noj.
Quantitative Heat Transfer Reduction vs. Nplai Thickness
Rau Qib 2 titanium, 15% Al₂(SO₄)₃ ntawm 70 degree, kub flux 20 W / cm²:
| Scale Thickness (hli) | Thermal Resistance Ntxiv (m²·K/W) | Txo cov cua kub hloov (%) | Yuav tsum muaj zog ntxiv |
|---|---|---|---|
| 0 (huv) | 0 | 0% | 1.0× |
| 0.1 | 0.00025–0.0005 | 10–20% | 1.1–1.25× |
| 0.2 | 0.0005–0.001 | 20–35% | 1.25–1.5× |
| 0.3 | 0.00075–0.0015 | 30–50% | 1.4–2.0× |
| 0.5 | 0.00125–0.0025 | 45–65% | 1.8–2.8× |
| 1.0 | 0.0025–0.005 | 65–85% | 2.8–6.5× |
Scale Growth Rate vs. Time
| Sijhawm (hli) | Scale Thickness (hli) | Txo cov cua kub hloov (%) |
|---|---|---|
| 100 | 0.05–0.10 | 5–15% |
| 500 | 0.15–0.30 | 20–45% |
| 1,000 | 0.25–0.50 | 35–65% |
| 2,000 | 0.40–0.80 | 50–80% |
Scale Management Guide
| Scale Thickness (hli) | Thaum tshav kub kub hloov pauv | Pom zoo ua | Ntxuav zaus |
|---|---|---|---|
| <0.1 | <15% | Tsis muaj | Txhua xyoo |
| 0.1–0.2 | 15–30% | Saib xyuas | Peb lub hlis twg |
| 0.2–0.5 | 30–60% | Ntxuav tam sim ntawd | Txhua hli |
| >0.5 | >60% | Tseem ceeb - huv tam sim no | Txhua lub lim tiam |
Kev pom zoo engineering
For aluminum sulfate service, clean the heater when scale thickness reaches 0.3 mm to prevent >50% tshav kub hloov pauv. Siv 5% hydrochloric acid ntawm 50℃rau 30 feeb kom yaj Al (OH)₃ nplai. Los ntawm kev tswj cov nplai tuab, tus kws ua haujlwm tswj xyuas cov khoom siv hluav taws xob hloov hluav taws xob.
